Air-heating device



(No Model.) 2 Sheath-Sheet 1.

-M. T. BALDWIN.

AIR HEATING DEVIGE. No. 379,755. Patented Mar. 20, 1888.

WITNESSES: V r l/Vl/ENTOI? Jljro 71 118427520131 N. PETERS.Fhowillhognphcr. Washm mm D. c.

(No Model.) 2 Sheets-Sheet 2. M. T. BALDWIN.

AIR HEATING DEVICE.

No. 379,755. Patented Mar. 20, 1888.

fl J? m B 0 IF I i t i I I II g il a l 5 I -P' lhu'l'l' ll F NI T T .3 J

I E fllfj% UNITED STATES PATENT OFFICE.

MYR-ON T. BALDYVIN, OF LA GRANGE, ILLINOIS.

AIR-HEATING DEViCE.

SPECIFICATION forming part of Letters Patent No. 379,755, dated March20, 1888.

Application filed May 13, 1887.

Serial No. 238.025. (No model.)

To all whom it may concern:

Be it known that I, MYRoN T. BALDWIN, a citizen of the United States,residing at La Grange, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement in Air Heating Devices;and I hereby declare the following to be a full, clear, and exactdescription of the same.

My device constitutes a hotair furnace, I which contains the fire-pot,combustion-ehanr her, the air fines or pipes through which passes theair to be heated by the products of combustion, the ash-pit, and also,as is common with hot-air furnaces generally, an outside covering orcasing.

It is my object to provide a device of the foregoing description whichshall, owing to its construction and resultant manner of action, operateto heat air rapidly and intensely by the consumption of a comparativelysmall quantity of fuel, permit quick cleaning to remove soot and ashes,allow the fire-pot to be easily replaced by a new one when damaged byuse, and which may be shipped in separate parts from the place ofmanufacture after the combustion-chamber and air-fines have been puttogether and cemented, so that it may be readily set up at its place ofuse by even inexperienced workmen.

My invention consists in the general construction of my device; and italso consists in certain details of construction and combinations ofparts, all as hereinafter more fully set forth.

Referring to the drawings, Figure l is a side elevation of my improveddevice with outside casing; Fig. 2, a vertical central section throughthe fire-pot and ash-pit, the position of which features with referenceto the body of the furnaceisindicated byheavylines; Fig. 3, aview inbroken side elevation of the furnace with the outer casing removed, andFig. at a horizontal section on the line 4 4 of Fig. 1 and viewed in thedirection of the arrows.

The inner shell, A, forms the sides of the combustion chamber and ismade of sheet metal. The plates B and B form, respectively, the top andbottom of the combustion chamber, are made of cast-iron, and each has onits outer edge a flange or collar, t, to receive between them theopposite edges of the shell A, held in place by bolts or rods 0, passedthrough ears D, extending laterally from the plates B and Bin verticalline with each other, the rods being fastened with nuts. (Not shown.)Therods and nuts likewise hold the plates B B together.

The combustion-chamber is oblong or oval in shape, as shown in Fig. 4,and has numerous small pipes or hot-air fines, E, passing through itperpendicularly and arranged in parallel or substantially parallel rowslongi tudinally ofthe combustion-chamber, thepipes being secured attheir opposite ends to the upper and lower plates, B and B, and coincidewith openings in the said plates in the usual manner of hot-air fines infurnaces. The fines E may be made of east or wrought iron or sheetsteel.

The legs F, or equivalent thereof, support one end of thecombustion-chamber, and the fire-pot G, resting on the ash-pit H, theother end of the same, as shown, whereby to remove the fire-pot for thepurpose of substituting another itis but necessary to pry orlift up theforward end of the combustion-chamber, draw out the old fire-pot, andinsert a new one. The casing I may be composed of sheet or galvanizediron, or may be made of brick where the furnaces are of large size andare to be permanently stationary.

At the lower front end of the casing I there is a movable section, I,which may be removed when it is desired to withdraw the fire-pot; and itis secured in place by means of rods 1'. inserted through cylindricalperforated cars 1- on the edges of the casing I and section I, whichears coincide vertically when the section I is adjusted in place.

As will be seen, my heating device contains numerous small flues,bywhich the air in process of being heated is subdivided into acorresponding number of small portions,whereby the air is more intenselyheated than it would be with the same degree of heat in thecombustion-ehamber were the dues of larger dimension.

Surfaces of metal forming the combustionchamber, or surfaces coming intocontact with the gases of combustion, soon become coated with ashes andsoot, which materially prevent the heat of combustion from radiatingthrough the metal. To facilitate the removal of this soot and ashes, Ihave arranged the fines in parallel rows in line with the fuel-door infront and from the fire-pot, whereby with a suita bly-constructed brushthe flues, and also the sides of the combustion-chamber, may be easilyand quickly cleaned, and by having the bases of the fines within thecombustion-chamber terminate on a level with the upper edge of thefire-pot in connection with the floor or lower terminus of thecombustion-chamber the accumulation of soot when brushed off thesurfaces may be readily drawn from between the fines into the fire-potand passed down into the ash-pit. To protect the lower end of the fluesand prevent particles of fuel from passing between them, I have placedaround the top of the fire-pot a movable ring, 0, formed,preferably,intwo parts, q and q, hinged together, as shown, and so arranged that thepart f may be turned back or the ring removed entirely, so as to bewithdrawn from between the top of the fire-pot and base of the flueswhen it is desired to clean the combustion-chamber and exterior of thetines.

The heat from the combustion within the fire-pot and the products ofcombustion rise directly upward from the fire-pot to the top of thecombustion-chamber,when they pass backward between and around the fluesand gradually settle as fresh hot products of combustion rise to taketheir place. At the rear extremity of the dues, occupying the extremeend of the combustion-chamber, is a space, K, constituting anequalizingdraft-chamber with a flueopening, 0, at its base and top for the passageof the gases of combustion into the chimney. The upper opening acts as adirect draft during the building ofa new fire, but is to be closed by adamper, m, in the pipe P during the active operation of the heater.

The lower openi ng, from which leads a pipe, P, having a damper, m, andinto which the pipe P enters, draws from the interior of the equalizingdraft-chamber those gases which immediately surround it, and which arere; placed by the gases from between the rows of fines at the base ofthe combustion-chamber, which, having become cool and more dense intheir contact with the air-flues, naturally pass into the equalizingdraft-chamber and flue opening at the bottom. Thus it may be seen thatthe heat from combustion is utilized the whole length of the air-fines.

Aside from the outside casing, which is provided with an opening, Z, oneach side near its base to permit the access of air into the flues, andwith openings 1 at intervals all around the top from which to distributethe hot air, the construction of the furnace ready for shipment is inthree distinct parts-namely, the combustion-chamber, containing theair-fines and equalizing draftchamber, the fire-pot, containing thegrate L, and the ash-pit H.

The narrow oblong shape and compactness of the combustion-chamber enableit to be easily transported after being put together at the place ofmanufacture, which enables the work to be more thoroughly done than ifshippedin separate parts and put together at the place .of use, and, inconnection with the fire-pot and ash-pit, may be set up quickly at itsdestination by inexperienced workmen.

Near the front end of the combustion-chamber, adjacent to the fuel-doorR at the base,directl-y in front of the dues, is a large opening, k, toreceive the upper end of the fire-pot, which passes into and supportsone end of the combustion-chamber. The lower end of the fire-pot restsabove the opening to the ashpit, the ash-pit resting on the ground orfloor of the place it occupies. The rear end of the combustion-chamberis supported by two legs, F. Thus it may be seen that when the lowerfront section, l,0f the outer casing is removed, as hereinbeforedescribed, the front end of the combustion-chamber may be raised orpried up by means of a lever from its resting-place.

on the fire-pot, when the latter may be easily withdrawn when damaged byuse and replaced by a new one.

The outside casing forms two air-chambersone below thecombustion-chamber, which receives through the openings Z from thesurrounding space or from the bases of rooms the air to be heated, andone (indicated at Z in Fig. l) at thetop of the combustionchamber, whichreceives air from the exterior of the combustion-chamber and from theinterior of the air-fines for distribution at the openings I.

What I claim as new, and desire to secure by Letters Patent, is-

1. In a heating device, the combination of a drum or shell, A, formingthe combustionchamber, a fire-pot, G, opening into the base of thecombustion-chamber. near its forward end in line with the fuel-door andflush with the said base, vertical fiues E, arranged in parallel orsubstantially parallel rows longitudinally within the combustion-chamberin line with the fuel-door, whereby ready access may be had through thefuel-door to opposite sides of each row of flues for the purpose ofcleaning, as described, an equalizing draftchamber, K, of the fullinterior width and height of the shell A between the rearmost transverserow of dues and adjacent end of the combustion-chamber, and aflue-opening, 0, in the base of the said equalizing draft-chamber,substantially as described.

2. In a heating device, the combination of a drum or shell, A, formingthe combustionchamber, a fire-pot, G, opening into the base of thecombustion-chamber near its forward end in line with the fuel-door andflush with the said base, a removable ring, 0, surrounding the mouth ofthe fire-pot, vertical flues E, arranged in parallel or substantiallyparallel rows longitudinally within the combustionchamber in line withthe fuel-door, whereby ready access may be had through the fuel-door toopposite sides of each row of dues for the purpose of cleaning, asdescribed, an equalizing draft-chamber, K, between the rearmosttransverse row of flues and adjacent end of the IIO combustion-chamber,and a fine-opening, o, in

the base of the said equalizing draftchamber,

substantially as described.

3. In a heating device, the combination of a drum or shell, A, formingthe combustion chamber, a fire-pot, G, opening into the base of thecombustion-chamber near its forward end in line with the fuel-door andflush with the said base, a removable ring, 0, surrounding the mouth ofthe fire-pot and formed in two parts, 1 and q, hinged together, verticalfiues E, arranged in parallel or substantially parallel rowslongitudinally within the combustion-chamber in line with the fuel-door,whereby ready access may be had through the fueldoor to opposite sidesof each row of fines for the purpose of cleaning, as described, anequalizing draft-chamber, K, between the rearinost transverse row offines and adjacent end of the combustion-chamber, and a flue-open ing,0, in the base of the said equalizing draftchamber, substantially asdescribed.

4. In a drum or shell, the combination of a drum or shell, A, formingthe combustionchamber, a removable fire-pot, G, supporting and openinginto the base of the combustionchamber near its forward end in line withthe fuel-door and flush with the said base, vertical fines E, arrangedin parallel or substantially parallel rows longitudinally within thecoinbustion-chamber in line with the fuel-door, whereby ready access maybe had through the fuel-door to opposite sides of each row of fiues forthe purpose of cleaning, as described, an equalizing draft-chamber, K,between the rearmost transverse row of fiues and adjacent end of thecombustion-chamber, a flue-opening, 0, in the base of the saidequalizing draft-chainber, and an outer shell, I, having a removablesection, I, substantially as described.

MYBON T. BALDWIN.

In presence of- G. P. LINDSLEY, J. W. DYRENFORTH.

